840012813 has 24 divisors (see below), whose sum is σ = 1247820288. Its totient is φ = 544141152.

The previous prime is 840012787. The next prime is 840012827. The reversal of 840012813 is 318210048.

It is not a de Polignac number, because 840012813 - 2⁸ = 840012557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840012853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 366156 + ... + 368442.

It is an arithmetic number, because the mean of its divisors is an integer number (51992512).

Almost surely, 2^840012813 is an apocalyptic number.

It is an amenable number.

840012813 is a deficient number, since it is larger than the sum of its proper divisors (407807475).

840012813 is a wasteful number, since it uses less digits than its factorization.

840012813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3433 (or 3430 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 840012813 is about 28982.9745367862. The cubic root of 840012813 is about 943.5435934844.

The spelling of 840012813 in words is "eight hundred forty million, twelve thousand, eight hundred thirteen".